--- a/hgext/largefiles/proto.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/hgext/largefiles/proto.py	Sun Oct 06 13:28:56 2019 -0400
@@ -8,6 +8,7 @@
 import re
 
 from mercurial.i18n import _
+from mercurial.pycompat import open
 
 from mercurial import (
     error,